Wind turbine



FIG. 1 is a perspective view of a wind turbine;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top right side perspective view thereof; and,

FIG. 5 is a bottom right side perspective view thereof, the left side, front and back views being identical thereto. 

CLAIM The ornamental design for a wind turbine, as shown and described. 